Bezier: harmonise icons with other graphical icons

Use grey for the main item, remove the endpoint circles.
Keep the blue highlight for the control handle line
(which is technically not where it goes on a single
bezier, but it is simpler that way).

Relates-To: https://gitlab.com/kicad/code/kicad/-/issues/8828

resources/bitmaps_png/sources/dark/add_bezier.svg

@@ -5,7 +5,7 @@
    viewBox="0 0 24 24"
    version="1.1"
    sodipodi:docname="add_bezier.svg"
-   inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+   inkscape:version="1.3.2 (091e20ef0f, 2023-11-25, custom)"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns="http://www.w3.org/2000/svg"
@@ -22,15 +22,15 @@
      guidetolerance="10"
      inkscape:pageopacity="0"
      inkscape:pageshadow="2"
-     inkscape:window-width="3156"
-     inkscape:window-height="1669"
+     inkscape:window-width="1920"
+     inkscape:window-height="1123"
      id="namedview30"
      showgrid="true"
-     inkscape:zoom="31.34512"
-     inkscape:cx="-0.82947522"
-     inkscape:cy="15.074117"
+     inkscape:zoom="27.321207"
+     inkscape:cx="12.902065"
+     inkscape:cy="9.6445226"
      inkscape:window-x="0"
-     inkscape:window-y="38"
+     inkscape:window-y="0"
      inkscape:window-maximized="0"
      inkscape:document-rotation="0"
      inkscape:current-layer="Слой_1"
@@ -44,7 +44,11 @@
        spacingy="0.5"
        color="#9999ff"
        opacity="0.13"
-       empspacing="2" />
+       empspacing="2"
+       originx="0"
+       originy="0"
+       units="px"
+       visible="true" />
   </sodipodi:namedview>
   <metadata
      id="metadata43">
@@ -84,23 +88,10 @@
      id="title344">add_line</title>
   <path
      id="line346"
-     style="fill:none;fill-opacity:1;stroke:#42b8eb;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+     style="fill:none;fill-opacity:1;stroke:#ded3dd;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
      d="m 18,3 c 0,0 2.5,8.5 -6.5,8.5 C 2.5,11.5 6,21 6,21"
      class="cls-1"
      sodipodi:nodetypes="csc" />
-  <ellipse
-     style="fill:#ffffff;fill-opacity:1;stroke:#42b8eb;stroke-width:1;stroke-linecap:round;stroke-dasharray:none;stroke-opacity:1"
-     id="path4797"
-     cx="18"
-     cy="3"
-     rx="1.5"
-     ry="1.4999999" />
-  <circle
-     style="fill:#ffffff;stroke:#42b8eb;stroke-width:1;stroke-linecap:round;stroke-dasharray:none;stroke-opacity:1"
-     id="path1792"
-     cx="6"
-     cy="21"
-     r="1.5" />
   <path
      style="fill:none;stroke:#42b8eb;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
      d="M 21,11.5 H 3"

resources/bitmaps_png/sources/light/add_bezier.svg

@@ -5,7 +5,7 @@
    viewBox="0 0 24 24"
    version="1.1"
    sodipodi:docname="add_bezier.svg"
-   inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+   inkscape:version="1.3.2 (091e20ef0f, 2023-11-25, custom)"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns="http://www.w3.org/2000/svg"
@@ -22,15 +22,15 @@
      guidetolerance="10"
      inkscape:pageopacity="0"
      inkscape:pageshadow="2"
-     inkscape:window-width="3156"
-     inkscape:window-height="1669"
+     inkscape:window-width="1920"
+     inkscape:window-height="1123"
      id="namedview30"
      showgrid="true"
      inkscape:zoom="31.34512"
-     inkscape:cx="-0.82947522"
-     inkscape:cy="15.074117"
+     inkscape:cx="11.500993"
+     inkscape:cy="14.914602"
      inkscape:window-x="0"
-     inkscape:window-y="38"
+     inkscape:window-y="0"
      inkscape:window-maximized="0"
      inkscape:document-rotation="0"
      inkscape:current-layer="Слой_1"
@@ -44,7 +44,11 @@
        spacingy="0.5"
        color="#9999ff"
        opacity="0.13"
-       empspacing="2" />
+       empspacing="2"
+       originx="0"
+       originy="0"
+       units="px"
+       visible="true" />
   </sodipodi:namedview>
   <metadata
      id="metadata43">
@@ -84,23 +88,10 @@
      id="title344">add_line</title>
   <path
      id="line346"
-     style="fill:none;fill-opacity:1;stroke:#1a81c4;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+     style="fill:none;fill-opacity:1;stroke:#545454;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
      d="m 18,3 c 0,0 2.5,8.5 -6.5,8.5 C 2.5,11.5 6,21 6,21"
      class="cls-1"
      sodipodi:nodetypes="csc" />
-  <ellipse
-     style="fill:#ffffff;fill-opacity:1;stroke:#1a81c4;stroke-width:1;stroke-linecap:round;stroke-dasharray:none"
-     id="path4797"
-     cx="18"
-     cy="3"
-     rx="1.5"
-     ry="1.4999999" />
-  <circle
-     style="fill:#ffffff;stroke:#1a81c4;stroke-width:1;stroke-linecap:round;stroke-dasharray:none"
-     id="path1792"
-     cx="6"
-     cy="21"
-     r="1.5" />
   <path
      style="fill:none;stroke:#1a81c4;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
      d="M 21,11.5 H 3"